# With respect to the Periodic Table, how do ionization energies differ?

May 4, 2017

$\text{Ionization energies}$ increase a Period (from left to right as we face the Table)...........

#### Explanation:

But decrease down a Group. We have antimony, and bismuth, Group 15 elements, and thus we would expect, $\text{a priori}$, that the second and third ionization energies of 5th Period antimony SHOULD be greater than those of 6th Period bismuth.........

But a scientist interrogates data. And we have no data.....

This graph gives the first ionization energy; it also gives the definition, where both reactant and oxidized product are in the gaseous phase:

$M \left(g\right) + \Delta \rightarrow M {\left(g\right)}^{+} + {e}^{-}$

You are going to have dig for successive ionization energies in order to illustrate your argument. So find the data first!